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/* Copyright (c) 2015-2018, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <odp_posix_extensions.h>
#include <odp/api/hints.h>
#include <odp/api/time_types.h>
#include <odp/api/abi/time_cpu.h>
#include <odp_debug_internal.h>
#include <time.h>
/* Measure TSC frequency. Frequency information registers are defined for x86,
* but those are often not enumerated. */
uint64_t _odp_time_cpu_global_freq(void)
{
struct timespec sleep, ts1, ts2;
uint64_t t1, t2, ts_nsec, cycles, hz;
int i;
uint64_t avg = 0;
int rounds = 3;
int warm_up = 1;
for (i = 0; i < rounds; i++) {
sleep.tv_sec = 0;
if (warm_up)
sleep.tv_nsec = ODP_TIME_SEC_IN_NS / 1000;
else
sleep.tv_nsec = ODP_TIME_SEC_IN_NS / 4;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts1)) {
_ODP_ERR("clock_gettime() failed\n");
return 0;
}
t1 = _odp_time_cpu_global();
if (nanosleep(&sleep, NULL) < 0) {
_ODP_ERR("nanosleep() failed\n");
return 0;
}
if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts2)) {
_ODP_ERR("clock_gettime() failed\n");
return 0;
}
t2 = _odp_time_cpu_global();
ts_nsec = (ts2.tv_sec - ts1.tv_sec) * ODP_TIME_SEC_IN_NS;
ts_nsec += ts2.tv_nsec - ts1.tv_nsec;
cycles = t2 - t1;
hz = (cycles * ODP_TIME_SEC_IN_NS) / ts_nsec;
if (warm_up)
warm_up = 0;
else
avg += hz;
}
return avg / (rounds - 1);
}
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